darwin.h revision 169689 
1/* Target definitions for x86 running Darwin.
2   Copyright (C) 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
3   Contributed by Apple Computer Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2, or (at your option)
10any later version.
11
12GCC is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with GCC; see the file COPYING.  If not, write to
19the Free Software Foundation, 51 Franklin Street, Fifth Floor,
20Boston, MA 02110-1301, USA.  */
21
22/* Enable Mach-O bits in generic x86 code.  */
23#undef TARGET_MACHO
24#define TARGET_MACHO 1
25
26#define TARGET_VERSION fprintf (stderr, " (i686 Darwin)");
27
28#undef  TARGET_64BIT
29#define TARGET_64BIT (target_flags & MASK_64BIT)
30
31#ifdef IN_LIBGCC2
32#undef TARGET_64BIT
33#ifdef __x86_64__
34#define TARGET_64BIT 1
35#else
36#define TARGET_64BIT 0
37#endif
38#endif
39
40/* Size of the Obj-C jump buffer.  */
41#define OBJC_JBLEN ((TARGET_64BIT) ? ((9 * 2) + 3 + 16) : (18))
42
43#undef TARGET_FPMATH_DEFAULT
44#define TARGET_FPMATH_DEFAULT (TARGET_SSE ? FPMATH_SSE : FPMATH_387)
45
46#define TARGET_OS_CPP_BUILTINS()                \
47  do                                            \
48    {                                           \
49      builtin_define ("__LITTLE_ENDIAN__");     \
50      darwin_cpp_builtins (pfile);		\
51    }                                           \
52  while (0)
53
54#undef PTRDIFF_TYPE
55#define PTRDIFF_TYPE (TARGET_64BIT ? "long int" : "int")
56
57#undef WCHAR_TYPE
58#define WCHAR_TYPE "int"
59
60#undef WCHAR_TYPE_SIZE
61#define WCHAR_TYPE_SIZE 32
62
63#undef MAX_BITS_PER_WORD
64#define MAX_BITS_PER_WORD 64
65
66#undef FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN
67#define FORCE_PREFERRED_STACK_BOUNDARY_IN_MAIN (0)
68
69/* We want -fPIC by default, unless we're using -static to compile for
70   the kernel or some such.  */
71
72#undef CC1_SPEC
73#define CC1_SPEC "%{!mkernel:%{!static:%{!mdynamic-no-pic:-fPIC}}} \
74  %{g: %{!fno-eliminate-unused-debug-symbols: -feliminate-unused-debug-symbols }}"
75
76#undef ASM_SPEC
77#define ASM_SPEC "-arch %(darwin_arch) -force_cpusubtype_ALL"
78
79#define DARWIN_ARCH_SPEC "%{m64:x86_64;:i386}"
80#define DARWIN_SUBARCH_SPEC DARWIN_ARCH_SPEC
81
82#undef SUBTARGET_EXTRA_SPECS
83#define SUBTARGET_EXTRA_SPECS                                   \
84  { "darwin_arch", DARWIN_ARCH_SPEC },                          \
85  { "darwin_crt2", "" },                                        \
86  { "darwin_subarch", DARWIN_SUBARCH_SPEC },
87
88/* Use the following macro for any Darwin/x86-specific command-line option
89   translation.  */
90#define SUBTARGET_OPTION_TRANSLATE_TABLE \
91  { "", "" }
92
93/* The Darwin assembler mostly follows AT&T syntax.  */
94#undef ASSEMBLER_DIALECT
95#define ASSEMBLER_DIALECT ASM_ATT
96
97/* Define macro used to output shift-double opcodes when the shift
98   count is in %cl.  Some assemblers require %cl as an argument;
99   some don't.  This macro controls what to do: by default, don't
100   print %cl.  */
101
102#define SHIFT_DOUBLE_OMITS_COUNT 0
103
104extern void darwin_x86_file_end (void);
105#undef TARGET_ASM_FILE_END
106#define TARGET_ASM_FILE_END darwin_x86_file_end
107
108/* Define the syntax of pseudo-ops, labels and comments.  */
109
110/* String containing the assembler's comment-starter.  */
111
112#define ASM_COMMENT_START "#"
113
114/* By default, target has a 80387, uses IEEE compatible arithmetic,
115   and returns float values in the 387.  */
116
117#define TARGET_SUBTARGET_DEFAULT (MASK_80387 | MASK_IEEE_FP | MASK_FLOAT_RETURNS | MASK_128BIT_LONG_DOUBLE)
118
119/* For now, disable dynamic-no-pic.  We'll need to go through i386.c
120   with a fine-tooth comb looking for refs to flag_pic!  */
121#define MASK_MACHO_DYNAMIC_NO_PIC 0
122#define TARGET_DYNAMIC_NO_PIC	  (target_flags & MASK_MACHO_DYNAMIC_NO_PIC)
123
124#undef GOT_SYMBOL_NAME
125#define GOT_SYMBOL_NAME (machopic_function_base_name ())
126
127/* Define the syntax of pseudo-ops, labels and comments.  */
128
129#define LPREFIX "L"
130
131/* These are used by -fbranch-probabilities */
132#define HOT_TEXT_SECTION_NAME "__TEXT,__text,regular,pure_instructions"
133#define UNLIKELY_EXECUTED_TEXT_SECTION_NAME \
134                              "__TEXT,__unlikely,regular,pure_instructions"
135
136/* Assembler pseudos to introduce constants of various size.  */
137
138#define ASM_BYTE_OP "\t.byte\t"
139#define ASM_SHORT "\t.word\t"
140#define ASM_LONG "\t.long\t"
141#define ASM_QUAD "\t.quad\t"
142
143#define SUBTARGET_ENCODE_SECTION_INFO  darwin_encode_section_info
144
145#undef ASM_OUTPUT_ALIGN
146#define ASM_OUTPUT_ALIGN(FILE,LOG)	\
147 do { if ((LOG) != 0)			\
148        {				\
149          if (in_section == text_section) \
150            fprintf (FILE, "\t%s %d,0x90\n", ALIGN_ASM_OP, (LOG)); \
151          else				\
152            fprintf (FILE, "\t%s %d\n", ALIGN_ASM_OP, (LOG)); \
153        }				\
154    } while (0)
155
156/* This says how to output an assembler line
157   to define a global common symbol.  */
158
159#define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
160( fputs (".comm ", (FILE)),			\
161  assemble_name ((FILE), (NAME)),		\
162  fprintf ((FILE), ",%lu\n", (unsigned long)(ROUNDED)))
163
164/* This says how to output an assembler line
165   to define a local common symbol.  */
166
167#define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
168( fputs (".lcomm ", (FILE)),			\
169  assemble_name ((FILE), (NAME)),		\
170  fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED"\n", (ROUNDED)))
171
172/* Darwin profiling -- call mcount.  */
173#undef FUNCTION_PROFILER
174#define FUNCTION_PROFILER(FILE, LABELNO)				\
175    do {								\
176      if (MACHOPIC_INDIRECT && !TARGET_64BIT)				\
177	{								\
178	  const char *name = machopic_mcount_stub_name ();		\
179	  fprintf (FILE, "\tcall %s\n", name+1);  /*  skip '&'  */	\
180	  machopic_validate_stub_or_non_lazy_ptr (name);		\
181	}								\
182      else fprintf (FILE, "\tcall mcount\n");				\
183    } while (0)
184
185#define C_COMMON_OVERRIDE_OPTIONS					\
186  do {									\
187    SUBTARGET_C_COMMON_OVERRIDE_OPTIONS;				\
188  } while (0)
189
190/* Darwin on x86_64 uses dwarf-2 by default.  */
191#undef PREFERRED_DEBUGGING_TYPE
192#define PREFERRED_DEBUGGING_TYPE (TARGET_64BIT ? DWARF2_DEBUG : DBX_DEBUG)
193
194/* Darwin uses the standard DWARF register numbers but the default
195   register numbers for STABS.  Fortunately for 64-bit code the
196   default and the standard are the same.  */
197#undef DBX_REGISTER_NUMBER
198#define DBX_REGISTER_NUMBER(n) 					\
199  (TARGET_64BIT ? dbx64_register_map[n]				\
200   : write_symbols == DWARF2_DEBUG ? svr4_dbx_register_map[n]	\
201   : dbx_register_map[n])
202
203/* Unfortunately, the 32-bit EH information also doesn't use the standard
204   DWARF register numbers.  */
205#define DWARF2_FRAME_REG_OUT(n, for_eh)					\
206  (! (for_eh) || write_symbols != DWARF2_DEBUG || TARGET_64BIT ? (n)	\
207   : (n) == 5 ? 4							\
208   : (n) == 4 ? 5							\
209   : (n) >= 11 && (n) <= 18 ? (n) + 1					\
210   : (n))
211
212#undef REGISTER_TARGET_PRAGMAS
213#define REGISTER_TARGET_PRAGMAS() DARWIN_REGISTER_TARGET_PRAGMAS()
214
215#undef TARGET_SET_DEFAULT_TYPE_ATTRIBUTES
216#define TARGET_SET_DEFAULT_TYPE_ATTRIBUTES darwin_set_default_type_attributes
217
218/* For 64-bit, we need to add 4 because @GOTPCREL is relative to the
219   end of the instruction, but without the 4 we'd only have the right
220   address for the start of the instruction.  */
221#undef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
222#define ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX(FILE, ENCODING, SIZE, ADDR, DONE)	\
223  if (TARGET_64BIT)				                                \
224    {                                                                           \
225      if ((SIZE) == 4 && ((ENCODING) & 0x70) == DW_EH_PE_pcrel)			\
226        {                                                                       \
227	   fputs (ASM_LONG, FILE);                                              \
228	   assemble_name (FILE, XSTR (ADDR, 0));				\
229	   fputs ("+4@GOTPCREL", FILE);                                         \
230	   goto DONE;                                                           \
231        }									\
232    }										\
233  else                                                                          \
234    {										\
235      if (ENCODING == ASM_PREFERRED_EH_DATA_FORMAT (2, 1))                      \
236        {                                                                       \
237          darwin_non_lazy_pcrel (FILE, ADDR);                                   \
238          goto DONE;								\
239        }                                                                       \
240    }
241
242/* This needs to move since i386 uses the first flag and other flags are
243   used in Mach-O.  */
244#undef MACHO_SYMBOL_FLAG_VARIABLE
245#define MACHO_SYMBOL_FLAG_VARIABLE ((SYMBOL_FLAG_MACH_DEP) << 3)
246